US9127672B2 - Gear pump - Google Patents

Gear pump Download PDF

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Publication number
US9127672B2
US9127672B2 US13/516,141 US201013516141A US9127672B2 US 9127672 B2 US9127672 B2 US 9127672B2 US 201013516141 A US201013516141 A US 201013516141A US 9127672 B2 US9127672 B2 US 9127672B2
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United States
Prior art keywords
rotor
driven
steam treatment
driving
given
Prior art date
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US13/516,141
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English (en)
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US20120251371A1 (en
Inventor
Hideo Nirasawa
Shigeru Kanehara
Shinichi HIRAI
Kosuke Yamane
Masahiko Shinohara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Yamada Manufacturing Co Ltd
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Honda Motor Co Ltd
Yamada Manufacturing Co Ltd
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Publication date
Application filed by Honda Motor Co Ltd, Yamada Manufacturing Co Ltd filed Critical Honda Motor Co Ltd
Assigned to HONDA MOTOR CO., LTD., YAMADA MANUFACTURING CO., LTD. reassignment HONDA MOTOR CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SHINOHARA, MASAHIKO, YAMANE, KOSUKE, HIRAI, SHINICHI, KANEHARA, SHIGERU, NIRASAWA, HIDEO
Publication of US20120251371A1 publication Critical patent/US20120251371A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/40—Heat treatment
    • F04C2230/41—Hardening; Annealing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/90—Improving properties of machine parts
    • F04C2230/92—Surface treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/16—Wear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2251/00—Material properties
    • F05C2251/10—Hardness

Definitions

  • the present invention relates to a gear pump that is used as an automotive oil pump and so on, and particularly to a technology of surface treatment on the rotor contacting surface of the gear pump.
  • Patent Document 1 discloses that, in a gerotor pump, contacting surfaces of both of an inner rotor and an outer rotor are given a surface treatment to be coated with a carbide or nitride film to improve abrasion resistance. Also, as a treatment of the contacting surfaces of both of the inner rotor and the outer rotor, a steam treatment has conventionally been known. Meanwhile, Patent Document 2 below discloses a configuration in which an entire surface of one of rotors is coated with a soft material having a self-lubricating property and an entire surface of the other of the rotors is given a surface treatment (plating process) to be coated with a hard material of appropriate thickness.
  • Patent Literature 1 Japanese Utility Model Application Publication No. Sho 63-202794
  • Patent Literature 2 Japanese Patent Application Publication No. Hei 3-168382
  • tooth surfaces (contacting surfaces) of both of the inner rotor and the outer rotor of a gerotor pump is improved with the steam treatment, embrittlement and delamination of the tooth surfaces have been observed in an operating status under the application of larger impulsive loads on the tooth surfaces.
  • embrittlement and delamination of the tooth surfaces have been observed in an operating status under the application of larger impulsive loads on the tooth surfaces.
  • an attempt has been made that neither of the tooth surfaces (contacting surfaces) is given the steam treatment.
  • adhesive wear occurs on some areas of the tooth surfaces during a continuous actuation of the pump, depending on a temperature range and/or a rotational speed range.
  • the present invention has been made to solve the above problems, and thus provide a gear pump with which the problems of delamination and adhesive wear of tooth surfaces can be solved.
  • the present invention provides an improved gear pump which comprises: a driving rotor ( 2 ) that is driven by a driving source; and a driven rotor ( 3 ) that is driven by the driving rotor, wherein the driving rotor and the driven rotor are rotated while meshing with each other to transfer working fluid, and wherein only one of the driving rotor and the driven rotor is given a steam treatment while the other remains untreated.
  • a driving rotor 2
  • a driven rotor 3
  • one of the driving rotor and the driven rotor of the gear pump is given the steam treatment while the other remains untreated.
  • the desired hardness of the tooth surface (contacting surface) of the one rotor can be therefore secured while the hardness of the tooth surface (contacting surface) of the other rotor is relatively low.
  • possible occurrence of adhesive wear and delamination of a tooth surface is reduced.
  • adhesive wear because the adhesion temperature of members of different materials in contact with each other is high, there is a less incidence of adhesion, and thus, the occurrence of adhesive wear is reduced.
  • FIG. 1 is a plan view, schematically showing a gerotor pump that is used as an oil pump for an automatic transmission as an embodiment of the present invention.
  • FIG. 2 is a perspective view, showing an inner rotor part and an outer rotor part in FIG. 1 .
  • a gerotor pump includes an inner rotor (driving rotor) 2 and an outer rotor (driven rotor) 3 that are housed in an oil pump body 1 .
  • the inner rotor 2 has outer teeth in an appropriate number “n” on its outer periphery
  • a drive shaft 4 is joined with an inner periphery of the inner rotor 2 with a spline, a claw, and so on
  • the outer rotor 3 has inner teeth in a larger number “n+1” than “n” on its inner periphery
  • the outer teeth and the inner teeth are meshed in such an arrangement that the outer rotor 3 is off-center from the center of the inner rotor 2 and incorporated in the oil pump body 1 .
  • any shaft such as a transmission input shaft, that performs rotational motion, is used as the drive shaft 4 .
  • the inner rotor 2 is rotationally driven by rotation of the drive shaft 4 , followed by rotation of the outer rotor 3 , and the outer teeth of the inner rotor 2 mesh with the inner teeth of the outer rotor 3 for rotation to pump a hydraulic oil (working fluid) in a cavity that is defined between the outer teeth and the inner teeth.
  • a hydraulic oil working fluid
  • a volume of the cavity between tops and bottoms of a pair of meshed teeth continuously changes, and accordingly, a pumping action is performed in which the hydraulic oil (working fluid) is suctioned into the cavity from an unillustrated suction port and is discharged to an unillustrated discharge port from the cavity.
  • the inner rotor 2 and the outer rotor 3 are made of an iron-based sintered metal.
  • one of the inner rotor 2 and the outer rotor 3 is given a steam treatment (heat treatment at approximately 500 degrees Celsius, for example), and the other is untreated (ungiven the steam treatment).
  • a surface of the one rotor ( 2 or 3 ) with the steam treatment is formed with an oxide film that increases hardness of the surface, thereby to improve abrasive resistance.
  • a surface of the other rotor ( 3 or 2 ) that is ungiven the steam treatment is not formed with the oxide film, the surface itself cannot be hardened.
  • the hardness of the tooth surface (contacting surface) of the one rotor ( 2 or 3 ) becomes relatively high with this treatment, and also because the hardness of the tooth surface (contacting surface) of the other rotor ( 3 or 2 ) in contact with the tooth surface (contacting surface) of the one rotor ( 2 or 3 ) becomes relatively low, there is a less incidence of delamination of the tooth surfaces when compared to a case where both of the tooth surfaces have a high hardness.
  • the hardness of the one tooth surface (contacting surface) is relatively higher than the other, the occurrence of adhesive wear of the tooth surfaces can also be reduced.
  • the steam treatment is given to a rotor with a larger number of teeth, that is, the outer rotor 3 .
  • the delamination of a tooth surface occurs when a high load acts on contacting portions of the tooth surfaces of the inner rotor and the outer rotor, causing an excessive surface pressure. Because the number of contacts of each teeth in a certain actuating period is larger for the inner rotor than for the outer rotor due to the less number of the teeth, the inner rotor is more likely to be subject to contact fatigue and thus to delamination of the tooth surface.
  • the outer rotor 3 with more number of teeth should be given the steam treatment while the inner rotor 2 with less number of teeth remains untreated. Accordingly, there is a less incidence of delamination of the tooth surface on the inner rotor 2 . Also, in this case, it is expected that slight deformation on the tooth surface of the inner rotor 2 that is not given the steam treatment reduces a contacting pressure against the outer rotor 3 , and accordingly, there is also a less incidence of delamination of the tooth surface on the outer rotor 3 that is given the steam treatment.
  • the purpose can be achieved as long as the tooth surface 3 b on the inner peripheral side of the outer rotor 3 is given the steam treatment.
  • the inner rotor 2 should preferably be given the steam treatment while the outer rotor 3 remains untreated.
  • the entire inner rotor 2 is given the steam treatment, films on both of side surfaces 2 a of the inner rotor 2 are removed by the subsequent grinding process, and the films formed by the steam treatment remain on a tooth surface 2 b on an outer peripheral side and an inner periphery 2 c ( FIG. 2 ).
  • the tooth surface 2 b on the outer peripheral side and the inner periphery 2 c of the inner rotor 2 are given the steam treatment. Accordingly, because the tooth surface 2 b on the outer peripheral side of the inner rotor 2 can be hardened, and also because the inner periphery 2 c can be hardened, there is also an advantage that it is possible to ensure abrasive resistance of the inner periphery 2 c that engages with/contacts the drive shaft 4 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)
US13/516,141 2009-12-15 2010-12-09 Gear pump Active 2031-02-09 US9127672B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2009284481 2009-12-15
JP2009-284481 2009-12-15
PCT/JP2010/072146 WO2011074477A1 (fr) 2009-12-15 2010-12-09 Pompe à engrenages

Publications (2)

Publication Number Publication Date
US20120251371A1 US20120251371A1 (en) 2012-10-04
US9127672B2 true US9127672B2 (en) 2015-09-08

Family

ID=44167233

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/516,141 Active 2031-02-09 US9127672B2 (en) 2009-12-15 2010-12-09 Gear pump

Country Status (5)

Country Link
US (1) US9127672B2 (fr)
EP (1) EP2514974A4 (fr)
JP (1) JP5364798B2 (fr)
CN (1) CN102652225B (fr)
WO (1) WO2011074477A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101455279B1 (ko) * 2014-01-09 2014-10-31 주식회사 신행 고압의 고점도 액이송을 위한 트로코이드 펌프
US10307931B2 (en) 2015-07-24 2019-06-04 The Research Foundation For Suny Oil delivery system for the lubrication of a chainsaw
CN105299422A (zh) * 2015-11-30 2016-02-03 重庆小康工业集团股份有限公司 可变排量机油泵
JP6933132B2 (ja) * 2017-12-27 2021-09-08 株式会社ジェイテクト ポンプ装置

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0378009A2 (fr) 1989-01-10 1990-07-18 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Rotors pour compresseur à vis
EP0533950A1 (fr) 1991-04-03 1993-03-31 Sumitomo Electric Industries, Ltd. Rotor en alliage d'aluminium pour pompe a l'huile et procede de fabrication dudit rotor
US5364250A (en) * 1992-09-18 1994-11-15 Hitachi, Ltd. Oil-free screw compressor and method of manufacture
JPH08144964A (ja) 1994-11-22 1996-06-04 Mitsubishi Materials Corp 内接式ギヤポンプ
EP0907023A1 (fr) 1997-10-03 1999-04-07 Sumitomo Electric Industries, Ltd. Elément coulissant composé d'alliage d'aluminium fritté et pompe à huile
US5997262A (en) * 1997-04-10 1999-12-07 Walbro Corporation Screw pins for a gear rotor fuel pump assembly
US6884049B2 (en) * 2001-12-12 2005-04-26 Hitachi, Ltd., Screw compressor and method of manufacturing rotor for the same
JP2005214140A (ja) 2004-01-30 2005-08-11 Mitsubishi Materials Corp オイルポンプ
EP1643127A2 (fr) 2004-09-30 2006-04-05 Sanyo Electric Co., Ltd. Compresseur
JP2007177735A (ja) 2005-12-28 2007-07-12 Ntn Corp ギアポンプ
JP2009013832A (ja) 2007-07-03 2009-01-22 Sumitomo Denko Shoketsu Gokin Kk ポンプロータ及びそれを用いた内接歯車ポンプ

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63202794A (ja) 1987-02-19 1988-08-22 富士電機株式会社 集合表示体
JPH03168382A (ja) 1989-11-24 1991-07-22 Hitachi Ltd スクリユー回転機械
JPH11141461A (ja) * 1997-11-04 1999-05-25 Mitsubishi Materials Corp 内接型ギヤポンプ用ローターの製造方法
CN2751155Y (zh) * 2004-08-19 2006-01-11 温州华润电机有限公司 用于汽车发动机的电喷泵

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0378009A2 (fr) 1989-01-10 1990-07-18 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Rotors pour compresseur à vis
EP0533950A1 (fr) 1991-04-03 1993-03-31 Sumitomo Electric Industries, Ltd. Rotor en alliage d'aluminium pour pompe a l'huile et procede de fabrication dudit rotor
US5364250A (en) * 1992-09-18 1994-11-15 Hitachi, Ltd. Oil-free screw compressor and method of manufacture
JPH08144964A (ja) 1994-11-22 1996-06-04 Mitsubishi Materials Corp 内接式ギヤポンプ
US5997262A (en) * 1997-04-10 1999-12-07 Walbro Corporation Screw pins for a gear rotor fuel pump assembly
EP0907023A1 (fr) 1997-10-03 1999-04-07 Sumitomo Electric Industries, Ltd. Elément coulissant composé d'alliage d'aluminium fritté et pompe à huile
US6884049B2 (en) * 2001-12-12 2005-04-26 Hitachi, Ltd., Screw compressor and method of manufacturing rotor for the same
JP2005214140A (ja) 2004-01-30 2005-08-11 Mitsubishi Materials Corp オイルポンプ
EP1643127A2 (fr) 2004-09-30 2006-04-05 Sanyo Electric Co., Ltd. Compresseur
JP2007177735A (ja) 2005-12-28 2007-07-12 Ntn Corp ギアポンプ
JP2009013832A (ja) 2007-07-03 2009-01-22 Sumitomo Denko Shoketsu Gokin Kk ポンプロータ及びそれを用いた内接歯車ポンプ

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Chinese Office Action issued Mar. 5, 2014; Chinese Application No. 201080056168.4.
European Extended Search Report dated Dec. 3, 2013, European Application No. 10837505.6, 5 pages.

Also Published As

Publication number Publication date
JPWO2011074477A1 (ja) 2013-04-25
WO2011074477A1 (fr) 2011-06-23
JP5364798B2 (ja) 2013-12-11
EP2514974A4 (fr) 2014-01-01
EP2514974A1 (fr) 2012-10-24
CN102652225A (zh) 2012-08-29
US20120251371A1 (en) 2012-10-04
CN102652225B (zh) 2014-12-17

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